After the Giant War, the entire camp knew Annabeth slept with Percy. Everyone let them be, they knew the two of them had nightmares, everyone except Leo.
One night, he'd put a trail of rose petals from the Athena to Poseidon cabins, confetti canons at the door of cabin three, and a giant neon sign that read "Congratulations, Can I Name It Leo Junior" on the roof of the Big House, clearly visible from anywhere in the camp.
Neither Percy nor Annabeth had appreciated his grand gestures very much. They'd officially shunned him for a month, and had gotten almost the entire camp to follow in their example. Even little Harley wouldn't talk to him, which was just plain mean.